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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards [Line Items]    
Valuation allowance $ 71.3 $ 51.4
Deferred tax assets 33.7 0.0
Capital gains 4.0  
Income taxes payable 28.9  
Income taxes receivable   $ 33.6
Deferred tax assets, remaining capital loss carryforwards 29.7  
Canada    
Operating Loss Carryforwards [Line Items]    
Undistributed earnings 71.1  
Tax that would be payable upon remittance of undistributed earnings 3.6  
State and Local Jurisdiction    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards 41.6  
Investment in Shift Technologies Inc.    
Operating Loss Carryforwards [Line Items]    
Valuation allowance 29.7  
Change in valuation allowance (4.3)  
State Net Operating Losses    
Operating Loss Carryforwards [Line Items]    
Valuation allowance 41.6  
Change in valuation allowance 24.2  
Capital Loss Carryforward    
Operating Loss Carryforwards [Line Items]    
Valuation allowance $ 29.7